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Transmission Line (TL) Review. WBS 1.1.3 Power Supply System Transmission Line (TL) Review Nancy Grossman FNAL April 23, 2003. Outline. Overview & Specifications (N. Grossman, 10’) Scope of review General Layout & Overall Specifications Schedule, Concerns
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Transmission Line (TL) Review WBS 1.1.3 Power Supply System Transmission Line (TL) Review Nancy Grossman FNAL April 23, 2003
Outline • Overview & Specifications (N. Grossman, 10’) • Scope of review • General Layout & Overall Specifications • Schedule, Concerns • Response to Recommendations (2/26/02 review) (N. Grossman, 10’) • Testing at MI8 (J. Hylen, 15’) • Remote clamp & joint testing so far • Future plans • Ionization Calculations (J. Hylen, 10’) • Cooling Calculations (A. Stefanik, 10’) • TL through Block & Beyond Design/Status (B. Boettinger, 45’) • Design (clamps, connection, supports) • Heating/cooling (expansion) & Vibration Issues • Service Considerations
Scope and Conceptual Layout:Target Hall Transmission • Material: Aluminum, Dimensions: 12 inches wide by 3/8 inch thick • Width: Stripline nominal width is 12 inches, reduce to 8” from below clamp to horns. • Gap: Stripline nominal spacing between bars is 3/8 inch, can increase in flex region. REMOVABLE28’ SECTION REMOVABLEZ-BAR ROCK WALL BETWEEN PS ROOM AND TARGET HALL- 23’ REMOTE CLAMP HORN 1 JOINT REMOVABLE Z-BAR REMOTE CLAMP HORN 2 JOINT
Scope/Charge to Group • Scope Includes: • Transmission Line design from joint/remote clamp to connection at capacitor bank • Electrical Isolation Considerations • Heating/cooling (thermal expansion) • Vibration • Stands & support structures to hold transmission line in place • Wedge clamps in the transmission line block • Support stands in the target hall • Three point support structure in 24” round penetration from hall to PS room • Service Considerations • Removing the section through the wall • Horn replacement • Cover to protect transmission line – to be designed, simple slanted sheet metal • Charge: • Look at overall design. • Consider QA, longevity, ESH issues. • Comment back to grossman@fnal.gov within a week.
MI-8 Fingers, Remote Clamp Remote clamp plugged in @ MI-8 Horn 1 joint/electrical plug @ MI-8 Routine pulsing of prototype horn 1, production horn 1 joint, remote clamp underway: ~370,000 pulses to date. Goal is 1 million pulses, 1/2 offset/flexed
Joints and Remote Clamp Horn 1 joint, remote clamp at MI-8 Horn 2 joint in machine shop (now done)
Overall Specifications/Concerns 1. Lifetime: • Part of stripline connected to horn will be replaced each time a horn is replaced, ~>1 year. • Part of stripline within stripline block (includes clamp) does not have to be replaced every time a horn is replaced, but we will most likely have a spare just in case. • Lifetime of NuMI ~ 10 years 2. Radiation Environment such that ceramics must be used near the beam, but not necessary above the module/T-blocks. • Ceramics spacers from horn to top of module/block • G-10 spacers used beyond that as insulators 3. Vibration, keep to a minimum everywhere. • Biggest horn vibration is from stripline (MI8 measurements) • Not near horn natural frequencies (200 Hz), damping times short wrt rep-rate • Clamp every 12” in target hall • Pulsed for about 9.5 millions pulses at MI-8 (non-joint portion of transmission line) with no problems – clamping every 12” • More on recent vibration measurements from Jim.
Overall Specifications/Concerns 4. Cooling • Target chase cooled by ~24,000 cfm flowing in the beam direction in the horn region and back in the opposite direction between the top of the T-blocks and the concrete cap. • Beam heating: ~183 KW/m3 (transmission line near the beam) • TL Electrical heating: ~27 KW/m3 (flex joint number) • Assume air cooling from target chase is sufficient (A. Stefanik talk) • Want air flow through TL shield block from top of module to horn (this air flow cools stripline) • Air dam is needed at the H-block cover between the module and the stripline along the target hall wall (intended to contain air-borne radiation). 5. Service Considerations: • Must not block survey holes in T-blocks just off module ends, need direct vertical line of sight. • Two removable sections to allow removal of section through the wall (28’). • Removable “z-bar”s at top of module/block. Allows replacement of horns.
Transmission Line: Through the Block ( figure slightly out of date )
Response to Recommendations:Horn PS/TL Review (August 2001) • Consider using a dynamic type fastener (e.g., spiralock nut) in the clamp joints and stripline support brackets. • This is being done, except in the block region where it is tack-welded to the fasteners. • Consider measuring bolt preload in critical connections by measuring bolt stretch as opposed to bolt torque. • Not sure how to implement this – ideas? • Consider longitudinal damping along the TL section along the Target Hall wall to damp out possible undamped vibrations from electrical pulsing. • Using polyeruthane isolators and swinging end-links (see Bill’s talk). • Worry about scratching the silver-plating off the TL “fingers” when clamping/unclamping. • Have seen no damage in the silver-plating on the TL fingers out at MI-8 and they have been connected and disconnected a few times. (more from Jim)
Response to Recommendations:TL, Remote Clamp, TL Block Review (Feb. 2002) • Flex Joint Comments (joint with slits) • No longer using a joint with slits. ANSYS shows we can get sufficient flexibility with the non-slitted design. Single strip force tests agree with the ANSYS analysis. Testing at MI-8 of the horn1 joint is going well. More from Jim – not specifically part of this review. • Suggest quantitative measurements be made at MI-8 (deflection at specific points, resonant frequencies, etc.) to compare to ANSYS calculations (and any other calculations) and thus support longevity estimates. • We are making some quantitative measurements at MI-8 and will compare measurements with predictions– Jim will talk about this. • Concerns abut a tight testing schedule at MI-8 which might be hard to meet if problems are encountered. • Agree. We have encountered problems, testing is tight, and we hope to make it (more from Jim). Can delay installation of horn PS & continue testing longer. • Concerns with human resources – lack of. • This is a constant battle we continue to fight. • Suggest pre-assemble entire setup (power supply to horns) at MI-8. • We will do this to the extent that we can.
Schedule & Concerns Schedule: • MI-8 testing until Horn PS removed for installation. • Test pulsing of horn 1 and horn 2 on test stand.
Schedule & Concerns Specific Concerns: • Making sure all bolts on the TL clamps are tighten (and remain tightened) • Checkout checklist item • Periodic checks in Target Hall? • QA that clamps are put together correctly • If doesn’t look like it is going together well, stop and ask expert. • Alignment rods at removable sections General Concerns: • Resources (manpower) • Engineering/drafting to get the design done and parts ordered/made • Technicians to get it assembled and installed • Fitting it all in with the target hall shield block installation & Module installation • Concerns about damaging the TL parts • Final connections of the TL to the horns/PS are near the critical path The transmission line (and joint) have always been underestimated in their complexity (cost, time to make, problems encountered in installation/testing).
